diff --git a/src/main/java/writer2latex/util/Calc.java b/src/main/java/writer2latex/util/Calc.java
index 4b173f1..ffa3c24 100644
--- a/src/main/java/writer2latex/util/Calc.java
+++ b/src/main/java/writer2latex/util/Calc.java
@@ -168,8 +168,8 @@ public class Calc {
 	public static final String multiply(String sPercent, String sLength){
 	    if (sLength.equals("0")) { return "0"; }
 	    float fPercent=getFloat(sPercent.substring(0,sPercent.length()-1),1);
-	    float fLength=getFloat(sLength.substring(0,sLength.length()-2),1);
-	    String sUnit=sLength.substring(sLength.length()-2);
+	    float fLength=getFloat(sLength.replaceAll("[^0-9,.,-]", ""),1);
+	    String sUnit=sLength.replaceAll("[0-9,.,-]", "");
 	    return Float.toString(fPercent*fLength/100)+sUnit;
 	}